<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Control</title>
</head>
<body>
{% if user %}
    Hello, {{ user }}!
{% else %}
    Hello, Stranger!
{% endif %}
<ul>
    {% for comment in comments %}
        <li>{{ comment }}</li>
    {% endfor %}
</ul>
</body>
</html>